Husband and wife found dead in Sydney mansion

Police are awaiting toxicology results to determine the causes of death of a husband and wife whose bodies were found inside their northern beaches mansion several weeks after they died.

The man and woman's badly decomposed bodies were discovered in the home on Gilwinga Drive in Bayview on December 7. It is believed they may have lain in the home for up to three weeks before their bodies were discovered.

A police spokeswoman said officers from the Northern Beaches local area command were investigating the couple's deaths.

Their cause of death had not been determined, she said.

"Police are awaiting the results of post mortem and toxicology reports," she said.

The spokeswoman could not confirm the identities of the pair, or a report that they were a reclusive couple aged in their 50s who had lived at the home for more than 20 years.